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工业纯钛经过8道次等通道弯角挤压处理后,在室温或液氮温度下进行轧制。随后以林格式人工模拟体液为腐蚀介质,对两步大变形前后纯钛的电化学腐蚀行为进行了研究。结果表明,8道次ECAE处理后获得的超细晶纯钛,较退火粗晶态具有更好的轧制变形能力。两步大变形制备超细晶纯钛不仅表现出良好的综合力学性能,而且具备优异的耐腐蚀性能。8道次ECAE处理的纯钛在室温冷轧后的耐腐蚀性较液氮温度冷轧后好,主要因为不同温度轧制织构组分改变使得平行于样品表面的晶面变为密排面或低指数晶面,比高指数晶面难溶解,呈现更优的耐腐蚀性能。
Industrial pure titanium after eight times the channel corner extrusion processing, at room temperature or liquid nitrogen temperature rolling. Subsequently, the forest corrosion behavior of simulated pure titanium was investigated. The electrochemical corrosion behavior of pure titanium before and after two-step large deformation was studied. The results show that ultrafine-grained pure titanium obtained after 8 passes of ECAE has better rolling deformation ability than annealed coarse grains. Two-step large deformation preparation of ultrafine-grained titanium not only shows good overall mechanical properties, but also has excellent corrosion resistance. 8-pass ECAE-treated pure titanium had better corrosion resistance after cold-rolling at room temperature than that of liquid nitrogen at cold temperature, mainly because the texture components changed at different temperatures so that the crystal plane parallel to the sample surface became dense row Or low index crystal face, which is more difficult to dissolve than the high index crystal face, showing better corrosion resistance.